After independence, the CPP government under Nkrumah sought to develop Ghana as a modern, semi-industrialized, unitary socialist state. The government emphasized political and economic organization, endeavoring to increase stability and productivity through labor, youth, farmers, cooperatives, and other organizations integrated with the CPP. The government, according to Nkrumah, acted only as "the agent of the CPP" in seeking to accomplish these goals.
The CPP's control was challenged and criticized, and Prime Minister Nkrumah used the Preventive Detention Act (1958), which provided for detention without trial for up to 5 years (later extended to 10 years). On July 1, 1960, a new constitution was adopted, changing Ghana from a parliamentary system with a prime minister to a republican form of government headed by a powerful president. In August 1960, Nkrumah was given authority to scrutinize newspapers and other publications before publication. This political evolution continued into early 1964, when a constitutional referendum changed the country to a one-party state. On February 24, 1966, the Ghanaian Army and police overthrew Nkrumah's regime. Nkrumah and all his ministers were dismissed, the CPP and National Assembly were dissolved, and the constitution was suspended. The new regime cited Nkrumah's flagrant abuse of individual rights and liberties, his regime's corrupt, oppressive, and dictatorial practices, and the rapidly deteriorating economy as the principal reasons for its action.
Shirley Graham Du Bois and Kwame Nkrumah at Du Bois' casket
